Device for producing bags by means of a mandrel wheel

ABSTRACT

A device for producing tubular wrappings for paper bags with a mandrel wheel rotating stepwise in a horizontal plane and having horizontally outwardly extending pairs of spaced parallel folding mandrels. The blanks of bag material are fed horizontally toward a position below the folding mandrels and are brought into contact pressure with a bottom face of the folding mandrels by upwardly moving folding boxes, whereupon a folding fork associated with each folding box moves upwardly to place and wrap the blanks against the sides and around the folding mandrels with the assistance of compressed air.

United States Patent Egli 51, June 6, 1972 54] DEVICE FOR PRODUCING BAGS BY 1,926,192 9 1933 Bronander ..93/12 c MEANS OF A MANDREL WHEEL 3,182,570 5/1965 Egli ..93/ 12 [72] Inventor: Alwin Egli, Beringen, Switzerland I FOREIGN PATENTS 0R APPLICATIONS [73] Assignee: Schweizerische lndustrie-Gesellschaft, 1,261,032 4/1961 France ..93/12 C Neuhausen am Rheinfalt, Switzerland Primary Examiner-Wayne A. Morse, Jr. [22] Flled: 1970 Attorney-Singer, Stern & Carlberg 21 A l.N 13132 l 1 pp 0 s7 ABSTRACT A device for producing tubular wrappings for paper bags with l Pr D [30] Foreign App canon lowly am a mandrel wheel rotating stepwise in-a horizontal plane and Feb. 25, 1969 Switzerland ..2819/69 having horizontally outwardly extending pairs of spaced paral- Iel folding mandrels. The blanks of bag material are fed 52] U.S. Cl. ..93/12 R, 93/59 PL h riz ntally ward a position below the folding mandrels and [51] int. Cl. ..B3lb 1/32, B3lb 1/64,B31c 1 02 are brought into Contact pressure with a bottom face of the 581 Field of Search ..93/12, 59 PL folding mandrels by upwardly moving folding boxes pen a folding fork associated with each folding box moves up- [56] References Cited wardly to place and wrap the blanks against the sides and UNITED STATES PATENTS Heim ..93 12 X around the folding mandrels with the assistance of compressed air.

1 Claims, 5 Drawing Figures PAIENTEDJIIN SIS]? 3 667,351

SHEUBUF 3.

Fig 3a DEVICE FOR PRODUCING BAGS BY MEANS OF A MANDREL WHEEL The invention relates to a device for the production of bags by means of a stepwise rotating mandrel wheel cooperating with folding members, whereby said mandrel wheel has arranged thereon groups comprising each two parallel folding mandrels, and in which bag material blanks are placed at a treatment station on the two parallel folding mandrels to be formed by the latter into hose-like jackets, covers, or wrappings.

Devices of this type are already known. They have theadvantage, that a doubling of theproduction may be attained, in

that at each operative cycle, simultaneously two wrappings may be produced. These devices could, however, up to now be utilized solely for the production of bags with relatively small cross-sectional surface, as the space requirement for two folding boxes at the same working station was sufficient solely if the dimensions of the foldingboxes did not exceed a certain limit. The size of the folding boxes is determined by the dimensions of the bag material blanks, which on their part depend on the size of the bags to be produced.

It has also been recommended to improve the space conditions for the arrangement of larger folding boxes by arranging the folding boxes with their feeding devices for the adjacent parallel folding mandrels at different stations of the mandrel wheel. This arrangement has, however, the disadvantage, that without substantial increase in the diameter and the number of the folding mandrels of the mandrel wheel solely single-walled bags may be produced. The number of the treatment stations required for the production of double-walled bags does not permit of being arranged in the utilization of mandrel wheels of ordinary size.

It is the object of the invention to overcome this disadvantage and to furnish a device with which at a treatment station two folding boxes of beyond average size may be arranged, which are not hindered by their working strokes.

The invention is characterized by two folding boxes pressing the blanks on the mandrels moved consecutively out of the inclined or arcuate path.

In thismanner, the two folding boxesmay be arranged in I their feeding position, in which one blank at a time is fed to them, adjacent one another, while each folding box may engage in its contact pressure position partially in thespace which is required by the other folding box. The production loss through the treatment step at this station, stacked as to time, is substantially less than upon utilization of a mandrel wheel with solely one folding mandrel per treatment station.

The drawing illustrates by way of example an embodiment of the device of the invention.

In the drawings:

FIG. I is a plan view of a portion of a mandrel wheel, with each two parallel folding mandrels and at one treatment station with two folding boxes;

FIG. 2 is a side elevation view of the treatment station shown in FIG. 1; and

FIGS. 3a, 3b and 3c illustrate diagrammatically each a dif- I ferent working position of the two folding boxes.

The mandrel wheel 1 of which only a portion is shown in FIG. I rotates with each twoparallel outwardly extending folding mandrels 2a, 2b stepwise or intermittent in direction of the arrow, in such manner that the folding mandrels 2a, 2b

' stop at each one of the individual operating stations, so that guide levers 4 are rigidly connected with arms 7 to which are pivotally attached actuating rods 8 which for example are proximately simultaneouslywith the folding boxes a vertical lifting movement for the pressing of the blank against the under side of the folding mandrel 2a, 2b.- The plates 1 la, Ilb are arranged on the upper ends of. vertical rods 12a, 12b, which are guided coaxially in vertical posts 13a, 13b which on their part may perform a lifting movement independently of the rods 12a, 12b. The posts l3a,'l3b carry on their upper ends folding forks 14a, 14b which serve for placing the blanks against the side walls of the folding mandrels. The folding forks 14a, 14b are moved through recesses 17 in the folding boxes 3a, 3b.

Furthermore, compressed air conduits 15 are provided which terminate in nonles 16. The jets of air issuing from these nonles serve for the alignment of the blanks in front of the folding forks 14a, 14!), so that the latter during their operating stroke place the blanks firmly against the side walls of the mandrels 2a, 2b.

The modus operandi of the device is as follows: As shown in FIG. 30, there is conveyed in the illustrated feeding position to each folding box in a manner known'per se a blank of the packaging material shown in dotted-dash lines. Now first the folding boxes 3a are lifted or transferred to the contact pres sure position shown in FIG. 3b. Practically simultaneously the folder plate 11a and the folding fork 14a are moved upwardly. The folder plate 11a presses the blank against the bottom surface of the folding mandrel 2a, while the folding fork 14a moves further upwardly so that the blank is placed against the side surfaces of the folding mandrel 2a. As soon as, however, the folder plate engages the folding mandrel 2a, the folding box 3a moves back again into its starting position. Now the left-hand folding box 3b is lifted and the operation described is repeated on the folding mandrel 2b. Y

The folding boxes, instead of being guided by double levers 4, 5, could also be guided in another manner, for example by means of inclined slide-ways. In such a case, thefolding boxes 3a, 3b would then not bemoved along an arcuate path, but along a rectilinearly inclined path.

What I claim is:

1. In a bag making apparatus including an intermittently rotating wheel having angularly spaced groups of two spaced parallel folding mandrels said groups of spaced mandrels, upon rotation of said wheel, being movable to an operating station having folding means for supporting and transferring blanks of bag material into contact pressure with said folding mandrels to form a tube-like wrapping, the improvement wherein said folding members comprise two laterally spaced folding boxes for supporting and transferring two blanks of bag material into contact pressure with respective ones of said mandrels, means for sequentially moving said folding boxes between a feed position in which the bag material is fed thereon and a fold position in which the blanks are in contact pressure with an associated mandrel to fold said blanks, and means mounting said folding members so that the movement of each of said folding members follows an arcuate path between said feeding position and said pressure contact position, said means mounting said folding members comprising a bearing support, a pair of guide levers each pivotally connected at one end to said bearing support and pivotally connected at the other end to said folding boxes, and wherein said means for moving said folding boxes in said arcuate path is connected to said guide levers.

l l I F 

1. In a bag making apparatus including an intermittently rotating wheel having angularly spaced groups of two spaced parallel folding mandrels said groups of spaced mandrels, upon rotation of said wheel, being movable to an operating station having folding means for supporting and transferring blanks of bag material into contact pressure with said folding mandrels to form a tube-like wrapping, the improvement wherein said folding members comprise two laterally spaced folding boxes for supporting and transferring two blanks of bag material into contact pressure with respective ones of said mandrels, means for sequentially moving said folding boxes between a feed position in which the bag material is fed thereon and a fold position in which the blanks are in contact pressure with an associated mandrel to fold said blanks, and means mounting said folding members so that the movement of each of said folding members follows an arcuate path between said feeding position and said pressure contact position, said means mounting said folding members comprising a bearing support, a pair of guide levers each pivotally connected at one end to said bearing support and pivotally connected at the other end to said folding boxes, and wherein said means for moving said folding boxes in said arcuate path is connected to said guide levers. 